Answer: Smooth ER.
- A Rough ER
- B Smooth ER
- C Golgi apparatus
- D Ribosome
Correct answer: B. Smooth ER
Explanation: Smooth ER (no ribosomes) is the site of lipid and cholesterol synthesis, and also involved in detoxification.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.